Invariance of Light Speed: Reality or Fiction?

Softcover. Good. This book was sent to Dr. David Bartlett of the Univ. of Colorado by Dr. Levy of France. Personal letter from Dr. Levy to Dr. Bartlett included. Text is very good——clean & tight & unmarked. Moderate shelf wear with 2 creases on front cover that intersect the spine. Dr. Bartlett's name written on front.